/* CSS Document */
/*author: Meng Jiao
	date:2020-2-11 20:30 
	version:1.0.1 */
* {
  box-sizing: border-box;
}

body {
  background: #efefef;
  margin-left: 0px;
  margin-top: 0px;
  margin-right: 0px;
  margin-bottom: 0px;
}

/* 导航条 */
.topnav {
  overflow: hidden;
  background-color: #333;
}

/*目录*/
.list {
  overflow: hidden;
  background-color: #efefef;
  margin-left: 50px;
  margin-top: 15px;
}
/*目录标题*/
.list p {
  display: block;
  color: #1393f1;
  font-size: 20px;
  background-color: #ffffff;
  padding-left: 30px;
  padding-top: 15px;
  padding-bottom: 15px;
  margin: 2px;
  text-decoration: none;
}
/*目录链接*/
.list a {
  display: block;
  color: #3f3f3f;
  font-size: 20px;
  background-color: #ffffff;
  padding-left: 30px;
  padding-top: 15px;
  padding-bottom: 15px;
  margin: 2px;
  text-decoration: none;
}
/* 目录链接颜色修改 */
.list a:hover {
  background-color: #ffffff;
  color: #1393f1;
  border-left-style: solid;
  border-left-color: #1393f1;
}
/*目录链接的活跃状态*/
.list .active {
  background-color: #ffffff;
  color: #1393f1;
  border-left-style: solid;
  border-left-color: #1393f1;
}

/* 左侧栏 */
.leftcolumn {
  float: left;
  width: 25%;
  background-color: #efefef;
}

/* 右侧栏 */
.rightcolumn {
  float: left;
  width: 75%;
  background-color: #efefef;
}

.install {
  background-color: #ffffff;
  margin-left: 15px;
  margin-top: 15px;
  margin-right: 30px;
  padding: 20px;
}
.course {
  background-color: #ffffff;
  margin-left: 15px;
  margin-top: 15px;
  margin-right: 30px;
  margin-bottom: 50px;
  padding: 20px;
}
/*文章*/
.article {
  padding-left: 20px;
}
/*文章标题*/
.article h1 {
  color: #000000;
  font-size: 20px;
  margin: 1px;
}
/*文章标题链接*/
.article a:link {
  text-decoration: none;
  color: #000000;
}
/*标题链接改变*/
.article a:hover {
  color: #0080ff;
  text-decoration: underline;
}
/*标题链接点击后颜色不变*/
.article a:visited {
  color: #0080ff;
  text-decoration: underline;
}
/*文章说明*/
.article .description {
  color: #929292;
  font-size: 15px;
  margin: 1px;
}
/*文章时间*/
.article .date {
  color: #929292;
  font-size: 13px;
  margin-left: 1px;
  margin-top: 10px;
  margin-bottom: 10px;
}

/*文字和标题*/
h1 {
  font-family: Times, "Times New Roman", "serif";
  font-size: 40px;
  margin-top: 10px;
}

h2 {
  font-family: Times, "Times New Roman", "serif";
  font-size: 20px;
}
p {
  font-family: Times, "Times New Roman", "serif";
  font-size: 15px;
  margin-bottom: 15px;
}

/*水平线*/
hr {
  margin-top: 20px;
  margin-bottom: 20px;
}
